I'm guessing you pictures are to big. You will need to re size them. If you right click on your picture and view the properties you could see the size of the pictures. Below is a quote from the cruisemates site.Your pictures should be no bigger the 500KB. I hope that helps.

Quote:

* Picture file sizes are limited to 500 KB! If your pictures are too big they may not load. Recommended dimensions are 800x600 pixels (landscape) or 600x800 pixels (portrait). You can use any photo editor to change their size before uploading.
* Avoid using quotes ( " ) and apostrophes ( ' ) in comments.
* If picture does not upload and you see this screen appear again, click on Manage Your Galleries in the gold bar above and click into this gallery again.